Improvement in spectacle-frames



J. W. STEWAM SPECTACLE-FRAME.

Patented Nov.30,1875.

N.17o,e44.

J m W J [live/ziel. A. M da' UNITED STATES JOHN W. STEWART, OF WOODVILLE, TEXAS, vASSI-@NOR OF TWO-THIRDS PATENT OEEIoEa HIS RIGHT TO JAMES K. DURHAM AND lJOHN N. GOOLSBEE.

IMPROVEMENT IN SPECTACLE-FRAMES.

Speciication forming part of Letters Patent No. 170,644, dated November 30, 1875; vapplication led July 15, 1875.

To all Iwhom it may concern Be it known that I, JOHN W. STEWART, of Woodville, in the county of Tyler and State of TeXas, have invented a certain Improvement in Spectacle-Frames, of which the following is a specification:

This invention relates to spectacle-frames in which the bows are turned into a coil near the points where they are connected to the lens-hoops for the purpose of forming springjoints, instead of the ordinary pivot-joints.

My' improvement consists of a peculiar method of confining the extreme inner ends oi" the bows between flan ges of the lens-hoops, which method will be fully described in the ensuing description, as specifically pointed out in the claims. My improvement further consists in forming what may be termed pads at the outer end ot the bows by ceiling such ends into volutes.

In the annexed drawings, Figure 1 is a perspective View of my improved spectacle-frame. Figs. 2 and 3 illustrate modified forms of bows. Fig. 3 shows, in perspective and on a magnified scale, the ends of' one of the lenshoops, sprung apart to expose the groove receiving the end of the coil of the bow.

The same letters of reference are used in all the figures in the designation of identical parts.

The lens-hoops A and A', connected, as usual, by the bridge c2, are divided, respectively, at ci 'and a. The adjacent ends of each hoop are provided with flanges b and b1, the latter having a screw-tap, b3, opposite to a countersunk hole, b2, inthe former, for the reception of a screw, e, by means of which the ends ofthe hoop are drawn together to clamp onto the lens. A semicircular groove, c, curved around the holes and intersecting a straight groove, c', is formed in each ot' the anges b and b1, in their contiguous faces, for

the reception of the end d of the bow D, said end d being curved at d to pass around the clamping-screw. The straight portions of the end d lie in the straight groove c and the curved portion d in the semicircular groove c.

The bows, whether of the form shown in Fig. 1, or Fig. 2, or Fig. 3, are always coiled near 'the end, which is to be secured between the iianges b and b1, as at D1, by giving it one or two turns, forming a spring at that point answering the purpose ot a hinge-joint, which is dispensed with. The bows are made of thin wire, the elasticity of the coil D1 being sufficient to cause the bows to press inward witha gentle force to hold the spectacles in position on the head of the wearer. When short bows, such as shown in Figs. l and 3, are

used, their extreme ends are coiled into a vovided with coils to the lexis-hoops, as I have shown and described it; nor do l claim broadly providing short bows with pads or holdingcups, but limit myself to such pads when formed out ot' the material of the bow itself, by coiling its end into avolute.

What I claim as myiuvention, and desire to secure by Letters Patent, is-

1. The bow D, coiled at D1, and terminating in the end d, curved at d', in combination with the lens-hoop A, having flanges b and b1, provided with straight grooves c', and intersecting semicircular grooves c, and the clamping-screw e, substantially as and for the purpose specified. 2. The bow D, turned into a volute, D2, at its extreme outer end, substantially as shown, and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- JNO. W. STEWART.

Witnesses:

T. D. BooK,

W. GHAs. HYDE. 

